9
will not be calibrated. To avoid oscillation, the OUTPUT terminal should be connected to a 50
Ω
load (especially when
using high frequency and square wave output), and the connecting cable should be as short as possible.
(3) When the
DUTY
knob is full counterclockwise, the ratio of positive state to negative state, should not be less
than 80:20. When the
DUTY
knob is full clockwise, the ratio of positive state to negative state, should not be
greater than 20:80. Square waves can be expanded to pulse waves, triangle waves can be expanded to ramp
waves, sine waves can be expanded to unsymmetrical sine waves. The Figure 7 shows the effect of the DUTY
control adjustment on different waveforms.
VAR Y T HE DUT Y OF S HOR T E R T IME S E C T ION B Y
ADJ US T ING T HE FR E QUE NC Y ADJ US T ME NT DIAL
P UL S E
(S QUAR E WAVE )
R AMP
(T R IANG L E WAVE )
T T L C MOS
UNS Y ME T R IC AL
(S INE WAVE )
VAR Y T HE DUT Y OF L ONG E R T IME S E C T ION B Y
ADJ US T ING T HE DUT Y C ONT R OL L E R
A. Zero DC Offs et
With Maximum S ignal
B . Offs et L imit
without C lipping
C . E xces s ive Offs et
All examples :
Output terminated
into 50
Ω
P OS IT IV E
DC OF F S E T
NE G AT IV E
DC OF F S E T
P OS IT IV E
DC OF F S E T
P OS IT IV E
DC OF F S E T
NE G AT IV E
DC OF F S E T
NE G AT IV E
DC OF F S E T
Figure 6
Figure 7
FUSE REPLACEMENT (See Figs. 2 and 4)
Preliminary:
Disconnect test leads from circuit and Function Generator. Push Power Switch off and unplug the
power cord from the rear of the Function Generator.
Warning: Failure to turn off and remove power from the Function Generator before changing the mains power
fuse could result in damage to the instrument and the operator.
Fuse replacement:
Remove the fuse by inserting a small flat blade screwdriver into the notch at the bottom of the
mains power connector socket. Slide the fuse holder out. Replace the fuse with one of the following:
115 VAC 50/60 Hz:
T0.315A/250V fuse (5mm x 20mm), I.R. 200A – Littel Fuse p/n 218.315, or Bussmann p/n. GDC-315mA.
230 VAC 50/60 Hz:
T0.160A/250V fuse (5mm x 20mm), I.R. 200A – Littel Fuse p/n 218.160, or Bussmann p/n.
GDC-160mA.
Warning:
Use only an equivalent fuse to the one specified. Use of an incorrect fuse could result in serious injury or
even death.
Reassembly:
Slide the fuse holder back into the fuse cavity and reconnect the power cord.
MAINTENANCE
The front panel and case can be cleaned with a mild solution of detergent and water. Apply sparingly with a soft
cloth and allow the function generator to dry completely before using. Do not use aromatic hydrocarbons or
chlorinated solvents for cleaning.
Repair
All test tools returned for warranty or non-warranty repair or for calibration should be accompanied by the
following: your name, company’s name, address, telephone number, and proof of purchase. Additionally, please
include a brief description of the problem or the service requested and include the test leads with the meter. Non-
warranty repair or replacement charges should be remitted in the form of a check, a money order, credit card with
expiration date, or a purchase order made payable to Amprobe® Test Tools.
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